Method of sealing a joint between two pipes

Details Method of sealing a joint between two pipes Method of sealing a joint between two pipes

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 58/18 (2006.01) F16L 59/20 (2006.01)

Patent

CA 2349713

The present invention provides a joint (6) between insulated pipes (4), which comprises: (a) two transport pipes joined together; (b) insulation on each transport pipe which ends short of the joint; (c) a casing surrounding the exposed portion of pipe; (d) a sleeve which provides a seal between an end of the casing and the adjacent pipe insulation, wherein the sleeve comprises recoverable polymeric material (1) coated at discrete regions with a sealant (3) and/or a heat-activatable adhesive (2), (preferably with the sealant (3) bridging the end of the casing and the pipe insulation to form a seal therebetween which can accommodate movement of the casing relative to the pipe insulation, and the adhesive (2) forming substantially annular bonds between the sleeve and the casing and between the sleeve and pipe insulation), characterised in that at least one region (4) of the sleeve, preferably between the sealant-coated and the adhesive-coated regions or at the edge of the sleeve, remains uncoated to provide a relatively high-friction slip-resisting grip when the sleeve is being recovered in use.

L'invention concerne un joint (6) situé entre des tuyaux (4) isolés, qui comprend a) deux tuyaux de transport joints l'un à l'autre, b) un revêtement isolant sur chaque tuyau de transport s'arrêtant juste avant le joint, c) un gainage entourant la partie exposée du tuyau et d) un manchon servant de joint d'étanchéité entre une extrémité du gainage et le revêtement isolant adjacent du tuyau. Le manchon contient une matière polymère (1) réutilisable enduite à des emplacements distincts au moyen d'un agent d'étanchéité (3) et/ou un adhésif thermocollant (2), (l'agent d'étanchéité reliant de préférence l'extrémité du gainage et le revêtement isolant du tuyau de façon à former un joint d'étanchéité entre ces deux éléments, qui permet le mouvement du gainage par rapport au revêtement isolant, et l'adhésif (2) formant des liaisons entre le manchon et le gainage et entre le gainage et le revêtement isolant), et caractérisée en ce qu'au moins une partie (4) du manchon, de préférence située entre les parties recouvertes de l'agent d'étanchéité et de l'adhésif ou au bord du manchon, demeure non enduite de façon à fournir une prise anti-dérapante et à frottement élevé lorsque le manchon est récupéré pendant son utilisation.

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